[Lift] Re: Caching JPA entities and JPA vs Hibernate
On Tue, Sep 30, 2008 at 11:54 PM, Tim Perrett [EMAIL PROTECTED] wrote: Having an issue with ehcache.xml being picked up. The docs say that it need to be on the classpath - I've tried having it in META-INF, WEB- INF/classes/META-INF but yet nothing seems to work. It never gets picked up...? Where can i stick it so that its forced to be read? IIRC, it needs to be at the top of the classpath, not under META-INF. Martin --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Caching JPA entities and JPA vs Hibernate
Sorry to drag this thread back up - I only just got back round to it (its my hobby project) WARN - No configuration found. Configuring ehcache from ehcache- failsafe.xml found in the classpath: jar:file:/Users/timperrett/.m2/ repository/net/sf/ehcache/ehcache/1.5.0/ehcache-1.5.0.jar!/ehcache- failsafe.xml WARN - Could not find a specific ehcache configuration for cache named [com.package.persistence.Domain]; using defaults. WARN - Could not find a specific ehcache configuration for cache named [com.package.persistence.Event]; using defaults. WARN - Could not find a specific ehcache configuration for cache named [com.package.persistence.Theme]; using defaults. Having an issue with ehcache.xml being picked up. The docs say that it need to be on the classpath - I've tried having it in META-INF, WEB- INF/classes/META-INF but yet nothing seems to work. It never gets picked up...? Where can i stick it so that its forced to be read? Cheers, Tim --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Caching JPA entities and JPA vs Hibernate
You're probably on the right track, although I want to clarify: are the entity and its collections something that won't change often? Do you need transactional views on it (i.e. changes made by one session are immediately visible in others)? From your question about caching at Boot it sounds like this may be something that never changes or very infrequently. If it's something that never changes then you may be able to just load it in Boot, touch the collections (to force the lazy retrieval) and then you never need to deal with the cache per se anyways. As for the Hibernate annotations, the only one that's strictly needed to enable caching is @org.hibernate.annotations.Cache What annotations besides that one are you using, and which ones are causing conflicts? There are quite a few that overlap with the JPA standard annotation, so when I use them I usually make specific imports. There are several good articles out there on how to do this out on the web: http://www.gridshore.nl/2008/04/29/using-ehcache-and-verifying-that-it-works-with-jpa-and-springframework/ In particular, it's important to differentiate between the entity cache (enabled with the above annotation) and the query cache. It sounds like you need the former. Derek On Mon, Sep 15, 2008 at 4:20 PM, Tim Perrett [EMAIL PROTECTED] wrote: Hey guys, Thanks for your replies. I had a play around with the caching today and appeared to be getting a whole bunch of conflicts with org.hibernate.annotations, however these might be resolvable either by using limited imports to just scrape through with the annotations I need, or somehow do it with the orm.xml Im actually needed to cache an entity that has two collections of entities (and those collections have zero subsequent collections); I think a second level cache is appropriate but im not 100% on how to go about configuring it. Am I on the right path here? Effectively, the entity and the collections i want to cache are used on a request basis so i want to cache them in order to reduce database load so im working along the lines that the in memory cache will be an order of magnitude quicker to read from than the DB. Lift wise, where should i be looking to load the entities into the cache - from boot perhaps? Its also unclear how it actually does the cache (well, i know it stores the dehydrated object), but i mean its not like you actually have to manually tell the cache to load up the data so when does it actually do the cache itself? (and how can i validate its gone in there?) Cheers for any pointers Tim --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Caching JPA entities and JPA vs Hibernate
Hey Derek, You're probably on the right track, although I want to clarify: are the entity and its collections something that won't change often? Do you need transactional views on it (i.e. changes made by one session are immediately visible in others)? From your question about caching at Boot it sounds like this may be something that never changes or very infrequently. If it's something that never changes then you may be able to just load it in Boot, touch the collections (to force the lazy retrieval) and then you never need to deal with the cache per se anyways. Bang on - they will barley ever change. Certainly for this phase they wont change at all. Later I could build an admin control that flushes the cache (or refreshes it etc) I guess. I'll try this in boot and see what happens As for the Hibernate annotations, the only one that's strictly needed to enable caching is @org.hibernate.annotations.Cache What annotations besides that one are you using, and which ones are causing conflicts? There are quite a few that overlap with the JPA standard annotation, so when I use them I usually make specific imports. There are several good articles out there on how to do this out on the web: http://www.gridshore.nl/2008/04/29/using-ehcache-and-verifying-that-i... In particular, it's important to differentiate between the entity cache (enabled with the above annotation) and the query cache. It sounds like you need the former. Cheers Derek, I'll give it a whirl and let you know how I get on :) Tim --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Caching JPA entities and JPA vs Hibernate
Cool. For now I'd say just load it once, although you might want to make your own object to manage it. You could easily make it a lazy var for now and turn it into a synchronized def later if you need flush behavior. Derek On Tue, Sep 16, 2008 at 6:59 AM, Tim Perrett [EMAIL PROTECTED] wrote: Hey Derek, You're probably on the right track, although I want to clarify: are the entity and its collections something that won't change often? Do you need transactional views on it (i.e. changes made by one session are immediately visible in others)? From your question about caching at Boot it sounds like this may be something that never changes or very infrequently. If it's something that never changes then you may be able to just load it in Boot, touch the collections (to force the lazy retrieval) and then you never need to deal with the cache per se anyways. Bang on - they will barley ever change. Certainly for this phase they wont change at all. Later I could build an admin control that flushes the cache (or refreshes it etc) I guess. I'll try this in boot and see what happens As for the Hibernate annotations, the only one that's strictly needed to enable caching is @org.hibernate.annotations.Cache What annotations besides that one are you using, and which ones are causing conflicts? There are quite a few that overlap with the JPA standard annotation, so when I use them I usually make specific imports. There are several good articles out there on how to do this out on the web: http://www.gridshore.nl/2008/04/29/using-ehcache-and-verifying-that-i... In particular, it's important to differentiate between the entity cache (enabled with the above annotation) and the query cache. It sounds like you need the former. Cheers Derek, I'll give it a whirl and let you know how I get on :) Tim --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
